Atari Video Cube

This prototype is the same as the final release. The number
on the EPROM labels is actually an internal Atari part number. C0120xx
was for NTSC carts and C0125xx was for PAL. The xx is the cart number
(70 in this case). Strangely the EPROMs are labeled V. Cube, could
this be another early name (Video Cube)?